Answer:
A. The metal has densely packed particles, which allows for more collisions in a given area.
Explanation:
Different objects exists in different states, which can only be either of the three viz: solid, liquid, and gases. In this question, both the metal part and plastic part of the seat belt are solids. However, one is a metal and the other a plastic.
The particles of solid substances are closely or densely packed together in such a way that increase in temperature or application of heat causes a rapid collision of its particles.
However, in the metal part of the seat belt, the metal has densely packed particles, which allows for more collisions in a given area than the plastic part. This accounts for the reason that the metal part of this seat belt is a better thermal conductor than the plastic part.
